body {
  margin: 0;
  font-family: "Helvetica Neue", Roboto, Arial, "Droid Sans", sans-serif;
  line-height: 2;
}

.col-middle {
  margin-top: 10%;
  text-align: center;
}

.error-number {
  font-size: 150px;
  letter-spacing: 5px;
  line-height: 90px;
  margin: 50px 0;
}
